You need to grant access for three users so that they can view and edit table data on a Cloud Spanner instance. What should you do? 

Answer options:

A. Run gcloud iam roles describe roles/spanner.databaseUser. Add the users to the role.
B. Run gcloud iam roles describe roles/spanner.databaseUser. Add the users to a new group. Add the group to the role.
C. Run gcloud iam roles describe roles/spanner.viewer - -project my-project. Add the users to the role.
D. Run gcloud iam roles describe roles/spanner.viewer - -project my-project. Add the users to a new group. Add the group to the role.

A